TinnerFlow™2nd YearYELLOW · Check FirstCold Intake Sleeve Condensation
Cold intake sleeves through humid spaces need insulation/vapor control. Dry the metal, seal air leaks, and wrap the sleeve with the approved vapor-tight insulation detail.
A fresh-air sleeve can carry cold outside air through a warm humid plenum. If the metal sleeve is exposed, humid air can condense on it and drip onto ceiling tile or drywall.
Check for missing insulation, open vapor barrier seams, air leaks, and cold metal contact. Wrap/insulate the sleeve per the mechanical insulation spec and seal the vapor barrier continuously so humid air cannot reach the cold metal.
Do not leave a cold outside-air sleeve bare in a humid plenum and expect paint or caulk to stop condensation.
Condensation can damage ceiling finishes, insulation, and wall cavities.
Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.